Use shielded cables, keep them away from each other as much as possible, cross them at or close to right angles when you can, and then don’t worry any more about it unless you have a specific noise issue. If you feel better lifting them off the floor, use whatever works for you. I wouldn’t spend a bunch of money on that stuff, although years ago when I used to believe the advertising I read, I did buy a set of Cable Elevators.
An inexpensive alternative that I find to be handy is to cut pieces of foam pipe insulation, which you can use to provide separation between cables that are crossing each other or even to elevate cables off the floor, but not very high. I usually cut them about 2-inches long and use the pre-cut slit to insert the cable in the middle. Using one on each crossing cable and resting them against each other provides almost an inch of separation.
